CVE-2026-89672Critical· 9.1▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: nfsd: gate nfs2 setacl by argp->mask The NFSACL v2 SETACL path shares the decoder convention used by its v3 sibling: nfsaclsvc_decode_setaclargs() fills in argp->acl_a…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 50.1 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 6.8
none → medium
— → 9.1
none → critical
9.1 → 6.8
critical → medium
6.8 → 9.1
medium → critical
9.1 → 7
critical → high
0.2% → 0.5%
7 → 9.1
high → critical
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
nfsd: gate nfs2 setacl by argp->mask
The NFSACL v2 SETACL path shares the decoder convention used by its v3 sibling: nfsaclsvc_decode_setaclargs() fills in argp->acl_access only when NFS_ACL is set in the request mask and argp->acl_default only when NFS_DFACL is set, leaving the other pointer NULL because the argument buffer is zeroed up to pc_argzero before decode.
nfsacld_proc_setacl() then hands both pointers to set_posix_acl() unconditionally. set_posix_acl(idmap, dentry, type, NULL) is the VFS "remove this ACL type" operation, so an omitted arm is indistinguishable from an explicit request to delete that ACL. A SETACL carrying only NFS_ACL silently strips the directory's default ACL; mask=0 strips both.
This is the same defect just fixed in nfsd3_proc_setacl(); apply the same remedy. Gate each set_posix_acl() call on its mask bit and initialize error to 0 so that a request with neither bit set leaves the on-disk ACLs untouched and returns success. The out_drop_lock path and the unconditional posix_acl_release() in nfsaclsvc_release_setacl() already tolerate the skipped arms.
Linux >= a257cdd0e2179630d3201c32ba14d7fcb3c3a055 < 8e4422b05f410f95c51b68a0db4bf1d87f6d22f5Linux >= a257cdd0e2179630d3201c32ba14d7fcb3c3a055 < e41d173d9dc735cecb15ab7aa63ecab09338f81bLinux >= a257cdd0e2179630d3201c32ba14d7fcb3c3a055 < f951b22dbeec46f2e0fba81cb80d1b0c686b61ebLinux >= a257cdd0e2179630d3201c32ba14d7fcb3c3a055 < 37eea38e7898538f0ec5f1eb8b18d8646e4be41cLinux >= a257cdd0e2179630d3201c32ba14d7fcb3c3a055 < a3a7e20ed66d3f04d37883c398da8a113b430769Linux 2.6.13Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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